Rebuild _authenticateObjects cache in mixed authentication setups
Rebuild _authenticateObjects cache in mixed authentication setups

When CertAuth is mixed with normal FormAuthentication the upgrade from Simple to Blowfish did not happen because of the internal _authenticateObjects cache. Calling constructAuthenticate() rebuilds this cache.
FIRSTdotorg/MISP,FloatingGhost/MISP,devnull-/MISP,FIRSTdotorg/MISP,MISP/MISP,MISP/MISP,devnull-/MISP,TheDr1ver/MISP,FloatingGhost/MISP,SteveClement/MISP,MISP/MISP,SteveClement/MISP,TheDr1ver/MISP,Rafiot/MISP,Rafiot/MISP,Rafiot/MISP,Rafiot/MISP,devnull-/MISP,FIRSTdotorg/MISP,SteveClement/MISP,FloatingGhost/MISP,MISP/MISP,MISP/MISP,devnull-/MISP,SteveClement/MISP,SteveClement/MISP,FIRSTdotorg/MISP,FloatingGhost/MISP,TheDr1ver/MISP,TheDr1ver/MISP